[Aquaman had not been expecting any other ponies to show up in the water, and he easily swims over to investigate the newcomer. He recognizes the basics of that costume in, well, in a flash.]

AHOY, Kid Flash! I can't say I was expecting to see you here!

[Come on, it's a big orange pony with a yellow mane, tail, and beard. He's got a trident on his flank. He's surrounded by fish and breathing and speaking underwater like it's nothing. That's got to be familiar enough, right?]